The lakes of Devonshire, as is the case in the majority of English counties, are little more than ponds. Cranmere Pool, in the great morass where many Devonshire rivers rise, lying in a dreary spot, as befits the reputed place of punishment of evil spirits, has shrunk of late years in consequence of much peat-cutting in its neighbourhood, and is now an insignificant pond, rarely more than seventy yards across, and in hot summers sometimes quite dry. Bradmere Pool and Classenwell Pool, the sites of old mine-workings, are beautiful little lakes, but they are only a few acres in extent. Burrator Reservoir has been made in order to supply water to Plymouth. The largest of these miniature lakes is Slapton Ley, or Lea, a long and narrow sheet of water, two and a quarter miles in length and measuring about 200 acres, separated from the sea, with which it was no doubt once connected, by a bank of fine shingle. The reeds of its north-eastern end, which are cut and sold for thatching, are the haunt of many water-birds; and the Ley is visited in winter by immense numbers of migratory ducks and waders. 6. Geology. Three main points characterise the geological features of Devonshire; the simplicity of the system in the west, north-centre and south-west of the county; the comparative complexity and variety of the strata in the east and south; and, most remarkable of all, the extraordinary number of outcrops of igneous rock, from the great mass of Dartmoor granite, which has no parallel in England, to the hundreds of small dykes or elvans that are scattered chiefly over the southern region, although some occur to the north and east of Dartmoor. The oldest rocks in Devonshire are probably not, as was once thought, the granites, but the highly altered or metamorphic formations in the extreme south; that is to say, the mica and quartz schists and the hornblende epidote schists which extend from near Start Point to Bolt Tail, a district which, owing in great measure to distortion by volcanic upheaval, includes some of the most picturesque scenery in Devon. Next in order of age is the series called Devonian, after the name of the county, in which they were first distinguished from the Old Red Sandstone. They are, however, by no means confined to Devonshire, but are very widely distributed, covering a large part of Cornwall, and occurring on the continent of Europe, especially in Russia, and in Asia and North and South America. The Devonian beds--which are found both in the north and south, occupying two distinct areas separated by widespread deposits of culm or carboniferous measures--were, it is thought, formed in open water, and probably at the same time that the Old Red Sandstone of the adjoining county of Somerset and elsewhere, which is not found in this county at all, was being deposited in estuaries and land-locked seas. NAMES OF SUBDIVISIONS CHARACTERS OF ROCKS SYSTEMS